106.s1-实现自定义归属地提示框的拖拽2

半透明Activity与拖动视图

最新推荐文章于 2025-12-05 16:05:14 发布

原创最新推荐文章于 2025-12-05 16:05:14 发布 · 674 阅读

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本文介绍如何在Android应用中实现一个半透明的Activity，并通过触摸操作任意拖动界面上的显示框。文中详细展示了如何配置Activity的透明主题、设置背景颜色，以及实现拖动效果的具体代码。

让activity的显示呈现半透明的效果

<activity android:name="com.ldw.safe.Activity.DragViewActivity"
            android:theme="@android:style/Theme.Translucent.NoTitleBar"
            ></activity>

同时需要在activity_drag_view.xml中设置背景的颜色，上面的效果是透明效果，再加上背景设置成半黑，就成了一个半黑的透明效果

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="#5000"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/tv_top"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:gravity="center"
        android:textColor="@color/black"
        android:textSize="20sp"
        android:padding="10dp"
        android:background="@drawable/call_locate_blue"
        android:text="按住提示框任意拖拽\n按手机返回按键立即生效" />

    <TextView
        android:id="@+id/tv_bottom"
        android:visibility="invisible"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:gravity="center"
        android:textColor="@color/black"
        android:textSize="20sp"
        android:padding="10dp"
        android:background="@drawable/call_locate_blue"
        android:text="按住提示框任意拖拽\n按手机返回按键立即生效" />
    <ImageView 
        android:id="@+id/iv_drag"
        android:layout_marginTop="80dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/drag"
        />

</RelativeLayout>

归属地的显示框框实现任意拖动，并注意到了边界，DragViewActivity.java

package com.ldw.safe.Activity;

import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.ldw.safe.R;

/*
 * 修改归属地的显示位置
 */
public class DragViewActivity extends Activity {

	private TextView tv_top;
	private TextView tv_bottom;
	private ImageView iv_drag;
	
	private int startX;
	private int startY;
	private SharedPreferences mPref;
	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_drag_view);
        
        mPref = getSharedPreferences("config", MODE_PRIVATE);
        
        tv_top = (TextView) findViewById(R.id.tv_top);
        tv_bottom = (TextView) findViewById(R.id.tv_bottom);
        iv_drag = (ImageView) findViewById(R.id.iv_drag);
        
        int lastX = mPref.getInt("lastX", 0);
		int lastY = mPref.getInt("lastY", 0);
		
		//获取屏幕的宽度和高度
		final int winWidth = getWindowManager().getDefaultDisplay().getWidth();
		final int winHeight = getWindowManager().getDefaultDisplay().getHeight();
		
		if(lastY > winHeight/2){
			//上边的提示框显示，下边的隐藏
			tv_top.setVisibility(View.VISIBLE);
			tv_bottom.setVisibility(View.INVISIBLE);
		}else{
			//上边的提示框隐藏，下边的显示
			tv_top.setVisibility(View.INVISIBLE);
			tv_bottom.setVisibility(View.VISIBLE);
		}
		
		// 获取布局对象，里面包含一系列的参数，比如边距等等
		RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) iv_drag
				.getLayoutParams();
		layoutParams.leftMargin = lastX;// 设置左边距
		layoutParams.topMargin = lastY;// 设置top边距
		// 重新设置位置
		iv_drag.setLayoutParams(layoutParams);
        
     // 设置触摸监听
        iv_drag.setOnTouchListener(new OnTouchListener() {

			@Override
			public boolean onTouch(View v, MotionEvent event) {

				switch(event.getAction()){
				case MotionEvent.ACTION_DOWN:
					//获取起始点在屏幕中的坐标
					startX = (int) event.getRawX(); 
					startY = (int) event.getRawY(); 
					break;
				case MotionEvent.ACTION_MOVE:
					
					//获取结束点的坐标
					int endX = (int) event.getRawX();
					int endY = (int) event.getRawY();
					
					//计算偏移量
					int dx = endX - startX;
					int dy = endY - startY;
					
					// 更新左上右下距离
					int l = iv_drag.getLeft() + dx;
					int r = iv_drag.getRight() + dx;

					int t = iv_drag.getTop() + dy;
					int b = iv_drag.getBottom() + dy;
					
					//边界判断
					if( l < 0 || r > winWidth || t < 0 || b > winHeight -20){
						break;
					}
					
					if(t > winHeight/2){
						//上边的提示框显示，下边的隐藏
						tv_top.setVisibility(View.VISIBLE);
						tv_bottom.setVisibility(View.INVISIBLE);
					}else{
						//上边的提示框隐藏，下边的显示
						tv_top.setVisibility(View.INVISIBLE);
						tv_bottom.setVisibility(View.VISIBLE);
					}

					// 更新界面
					iv_drag.layout(l, t, r, b);
					
					// 重新初始化起点坐标
					startX = (int) event.getRawX();
					startY = (int) event.getRawY();
					break;
				case MotionEvent.ACTION_UP:
					// 编辑保存记录坐标点
					Editor edit = mPref.edit();
					edit.putInt("lastX", iv_drag.getLeft());
					edit.putInt("lastY", iv_drag.getTop());
					edit.commit();
					break;
				}
				
				return true;
			}
     			
     	});
	}
}